Theodore h



N0. 627,!03. Patented June 20, I899.

T. H. CURTIS.

VALVE.

(Application filed Mar. 4, 1899.)

(No Model.)

i ATENT O FICE.

THEODORE 1-1. CURTIS, OF CLEVELAND, OHIO, ASSIGNOR TO JOHN G. TALMAGE, OF SAME PLACE.

VALVE.

. sPEc'IFIoATI'oN formingpart of Letters Patent No. 627,103, dated June 20, 1899.

Application filed March 4, 1899.

To all whom it may concern:

Be it known that I, THEODORE H. GUErIs, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented a certain new and useful Improvement in Valves, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings.

The chief object of the invention is to provide a valve ofsuch construction that the valve-seat and the valve-disk may when worn or scratched be removed and other like devices substituted very quickly and without changing the position of the valve-casing relative to the inlet-pipes or other device which discharges into it. In the best construction, as shown, it is likewise unnecessary to change the position of the valve-casing relative to either the inlet or discharge pipe in order to effect such removal and substitution.

The invention consists of the construction and combination of parts hereinafter described, and pointed out definitely in the claims.

In the drawings, Figure l is a side elevation, partly in section, of a valve embodying my invention. Fig.2 is a detached side view of the valve-disk. Fig. 3 is a plan viewof a split collar to which link K is connected. Fig. 4 is a bottom view of the cap wherewith said valve-disk is attached to the stem, and Fig. 5 is a bottom view of the valve.-disk.

Referring to the parts by letters, -A represents the valve-casing, which may be of any suitable form. It has an outlet-opening a and the inlet-opening a. The latter passes. through a lateral extension a which is ca pable of being attached to a pipe or boiler. The specific construction shown is especially adapted for a blow-off valve for a locomotiveboiler, and this extension is therefore externally threaded, whereby it may be screwed into the boiler.

B represents a valve-seat bushing which is adapted to be inserted in the outlet-opening of the casing. The inner end of this bushing is finished to form a valve-seat, and the bushing is also provided at its outer end with an external flange 1), which is nicely finished on that face which engages with the end of the Serial No. 707,776. (No model.)

casing surrounding the outlet-opening a. A

tight joint is therefore formed when this flange is pressed with sufficient force against the casing. Means are provided for holding this bushing in the described position and for connecting a discharge-pipe over the outletopening. for producing this result, because it permits the removal of the valve-seat and valve and which flange engages with the flange c on the sleeve 0.

E represents a distance-ringwhich is placed between the sleeve 0 and the bushing B. When the coupling-sleeve D is screwed upon the casing, the bushing B, connection-sleeve O, and the distance-ring E are drawn together, and the holes through them are in line with each other and form the discharge port, through which fluid may flow fronrthe casing into the discharge-pipe. The valve N is adapted to be moved at will into and out of contact with the valve-seat by suitable mechanism. -The best construction of the valve and its operating mechanism now known to me is that which is shown in the drawings, because, first, the valve is thereby moved in right lines toward and from the seat, wherefore there is no grinding action of the valve upon the seat, as there would be if the valve turned, and, second, the valve, as well as its seat, may be easily removed and another secured in operative position. The valve and its operating mechanism, as shown, will now be described.

The valve-stem H is slidable through a studing-box J in the casing opposite to the outlet- Opening a and it has a head it on itsinner end. A collar M surrounds the stem just above this head, engaging with the square part 72/ of said stem, and it has a depending annular internally-threaded flange m. The valve Nhas The drawings show the best means.

in its upper side a recess 97. to receive the head of the valve-stem. It is externallythreaded to fit the internal screw-threads on the collar M referred to. On its lower face is a nicelyfi nished annular surface 11, which is adapted to engage with the valve-seat 12 A centrally-placed square head 77. is formed on the lower end of the valve-stem and furnishes means for turning the valve to screw it on or unscrew it. The specific means for connecting the valve to the stemis not material. It is desirable, however, that the means besuch as will permit the valve to be disconnected from the stem.

An operating-lever P is pivoted to the up per end of the valve-stem and one end of the lever is pivotally connected with the upper end of the link K, the lower end of which is pivoted to the clamp-collar R, which is fas tened to the casing. This affords efficient means for moving the valve toward and from its seat without giving it a rotary motion. As before stated, the valve shown is especially designed for a blow-oif valve for locomotiveboilers, although it may be used for many other purposes. -When used for the purpose stated, the extension a is screwed into the boiler and the collar O is connected with a discharge-pipe. The character of fluid which will flowthrough the valve when used for this purpose is such that it contains sand and grit and various kinds of foreign materials, which when the valve is closed are apt to scratch and wear both the valve and the seat, whereby the valve will leak.

With the construction shown it is unnecessary to disconnect the valve-casing either from the discharge-pipe or from the boiler when the valve gets to leaking. All one has to do is to unscrew the coupling-piece D and push it down on the discharge-pipe. One may then pull the distance-ring E out of its position between the bushing B and the connection-sleeve C. One may then pull the valve-seat bushing B down to the position formerly occupied by the distance-ring and may then pull it out sidewise through the opening between the sleeve O and the end of the valve-casin g. The operator may then pull out the pin which connects the valvestem II with the lever P and then push the valve-stem down until the operator may reach the square head of the valve. The valve may then be unscrewed and disconnected from the valve-stem and drawn laterally out through Having described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a valve, the combination of a valvecasing having inlet and outlet openings, and a removable valve-seat bushing which is held in the outlet-opening, with a connectionsleeve, a distance-ring placed between said bushing and sleeve, and means for holding said parts in the described relation to each other, substantially as and for the purpose specified.

2. In a valve, the combination of a valvecasing having inlet and outlet openings, and a removable valve-seat bushing which is inserted in the outlet-opening and has an external annular flange on its outer end which engages with the casing, with a connectionsleeve, having an external annular flange, a distance-ring placed between the bushing and sleeve, and a coupling-sleeve which is screwed onto the casing and has an internal flange at its outer end, substantially as and for the purpose specified.

3. In a valve, the combination of a Valvecasing having inlet and outlet openings, and a removable valve-seat bushing which is held in the outlet-opening, with a connection sleeve, a distance-ring placed between said bushing and sleeve, means for holding said parts in the described relation to each other, a valve, and operating mechanism therefor, substantially as and for the purpose specified.

4. In a valve the combination of a valve casing having inlet and outlet openings, and a removable valve-seat bushing which is inserted in the outlet-opening and has an external annular flange on its outer end which engages with the casing, with a connectionsleeve, having an external annular flange, a distance-ring placed between the bushing and sleeve, a coupling-sleeve which is screwed onto the casing and has an internal flange at its outlet end, a longitudinally-movable valvestem and a valve removably secured to said stem, substantially as and for the purpose specified.

5. In a valve, the combination of a valvecasing having inlet and outlet openings and a removable valve-seat held in the outletopening, with a valve-stem which extends through the wall of the casing and has an an nular flange on its inner end, a collar engaging with said stem above the flange and prevented from rotating independently of the stem, a valve-disk seating on said seat and having threads bywhich it screws onto said collar, said valve-disk having on its outer face engageable shoulders whereby the valvedisk may be grasped from the outer end and unscrewed from the collar, substantially as and for the purpose specified.

6. In a valve, the combination of a valvecasing having inlet and outlet openings, and a removable valve-seat sleeve held in the outlet-opening, with a valve-stem which extends through the Wall of the casing and has an ancentrally-placed angular projection, substannular flange on its inner end and an angular tially as and for the purpose specified. IO

shank just above said flange, a collar engaging with said shank and having an internallythreaded cylindrical annular flange, a valvedisk having a recess in its inner end and external screw-threads with which the said collar engages, and having on its outer face a In testimony whereof I hereunto affix my signature in the presence of two Witnesses.

THEODORE H. CURTIS.

Witnesses:

E. L. THURSTON, PHILIP E. KNOWLTON. 

